code: def logout_dockerhub():
      """
      Log out of DockerHub to delete local credentials
      :return: None
      """
      logging.info("Logging out of DockerHub")
      subprocess.call(["docker", "logout"])
      logging.info("Successfully logged out of DockerHub")
  
file_path: mxnet/ci/docker_login.py
imports: import argparse
  import json
  import logging
  import os
  import subprocess
  import sys
  from util import retry, config_logging
label_desc: Use image node_id 3 for calling a global function with example usage: logout_dockerhub() without return types